Group Workouts, powered by SharePlay, let you and up to 32 of your favorite people work out together. You can start a FaceTime call on your iPhone or iPad, then start a Group Workout in the Fitness app on iPhone, iPad, or Apple TV.
How to use FaceTime to start a Group Workout
Start a FaceTime call
Open the Fitness app, if you don't have it already its free in the App Store
Select a workout
Start the workout
Tap SharePlay to begin the workout with everyone in the call
When the workout is complete, tap X in the top-left corner of the screen
For everyone in the call with access, the workout plays at the same time.